GB2267759A - Monitoring pressure of rotating tyre - Google Patents
Monitoring pressure of rotating tyre Download PDFInfo
- Publication number
- GB2267759A GB2267759A GB9212048A GB9212048A GB2267759A GB 2267759 A GB2267759 A GB 2267759A GB 9212048 A GB9212048 A GB 9212048A GB 9212048 A GB9212048 A GB 9212048A GB 2267759 A GB2267759 A GB 2267759A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tyre
- variable
- pressure
- tyre pressure
- monitoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0089—Transmitting or indicating the displacement of pistons by electrical, electromechanical, magnetic or electromagnetic means
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Apparatus for monitoring tyre pressure comprises a piston 18 extending into a port 16 which is in communication with the air within a tyre. The upper end of the piston extends into a hydraulic fluid chamber 20. As the air pressure within the tyre increases, the piston is caused to move further into the chamber. This causes outward movement of one or both of a pair of opposed pistons 22 and 24 against the action of compression springs 26. A decrease in the tyre pressure causes the piston 18 to move outwardly with respect to the chamber, allowing the pistons 22 and 24 to move inwards. Thus the movement of the pistons is proportional to the tyre pressure. Each piston 22, 24 carries a magnetic pole 28, 30 which passes over a static magnetic road head (36, Fig. 2) as the wheel rotates. As the poles pass over the read head, electro-magnetic pulses are generated. The time between the pulses gives an indication of the tyre pressure after the speed of rotation of the wheel has been taken into account. <IMAGE>
Description
TYRE PRESSURE MONITORING
The present invention relates to tyre pressure monitoring apparatus, a vehicle incorporating tyre pressure monitoring apparatus and a method of monitoring tyre pressure.
According to one aspect of the present invention tyre pressure monitoring apparatus includes pressure responsive means arranged, in use, to be mounted to rotate with a tyre being monitored and arranged to produce a variable proportional to the tyre pressure and receiving means arranged to receive a variable from the pressure responsive means, the receiving means, in use, being arranged to receive the variable from the pressure responsive means, and control means arranged to monitor the variable received by the receiving means.
The pressure responsive means may comprise at least two relatively moveable magnetic portions with the variable being arranged to be proportional to the distance between the magnetic portions.
At least one of the magnetic portions may be arranged to move in response to a change in pressure in a tyre, when the device is mounted on the tyre. At least one magnetic portion may be in communication with a fluid chamber with another part of the fluid chamber being in communication with a moveable member arranged to move further into the chamber when the device is mounted on the wheel and the tyre pressure increases. At least one of the magnetic portions may be resiliently biased in a direction to tend to reduce the volume of the fluid chamber.
The pressure responsive means may comprise pulse generation means with the variable being arranged to be the time between the pulses.
The apparatus may include speed monitoring means arranged to enable the control means to give an indication of the tyre pressure after account has been taken of the speed of rotation on which the apparatus is mounted. The speed monitoring means may comprise means arranged, in use, to be located on a wheel and to give a signal proportional to the speed of rotation of the wheel.
The receiving means may comprise a magnetic read head.
The receiving means may be arranged to generate an electro-magnetic signal proportional to the tyre pressure.
The present invention also includes a vehicle including tyre pressure monitoring apparatus as herein referred to mounted thereon.
According to a further aspect of the present invention a method of monitoring tyre pressure comprises monitoring the pressure while the tyre is rotating.
The method may comprise generating a variable as the tyre is rotating with the variable being proportional to the tyre pressure. The variable may be proportional to the speed of rotation of the tyre. The method may comprise giving an indication of the tyre pressure from the variable after taking the speed of rotation into account. The method may comprise generating the variable magnetically and may comprise generating the variable electro-magnetically. The method may comprise causing two indicators to move relative to each other when there is a change in tyre pressure and using the distance between the two indicators to create the variable.
The present invention includes any combination of the herein referred to features or limitations.
The present invention may be carried into practice in various ways, but one embodiment will now be described by way of example and with reference to the accompanying drawings in which:
Figure 1 is a schematic cross-section through a tyre pressure responsive device 10;
Figure 2 is a schematic cross-section through a wheel 12 and brake calliper 14 showing the location on the device 10,
and Figure 3 is a schematic block diagram showing how the information from the device 10 is analysed.
The device 10 is arranged to be mounted on the internal diameter of a wheel such that the device rotates with the wheel. The device includes a port 16 which is in communication with the air within the tyre. Piston 18 extends into the port and is acted upon by the tyre pressure. The other end of the piston 18 extends into a hydraulic fluid chamber 20.
If the air pressure within the tyre increases then the piston 18 is caused to move further into the chamber 20. As the fluid in the chamber is incompressible, the inwards movement of the piston 18 is compensated for by outwards movement of one or both of a pair of opposed pistons 22 and 24, against the action of associated compression springs 26. Similarly if the air pressure within the tyre decreases then the springs 26 will urge the pistons 22 and 24 further into the chamber and cause the piston 18 to move further into the port 16.
It can be seen that, for a given increase or decrease in pressure there will be a predetermined degree of relative movement between the pistons 22 or 24, regardless of whether only one piston moves, or whether both move an equal or unequal extent. Furthermore, the distances between poles 28 and 30 on each piston will be proportional to the tyre pressure. It is envisaged that in normal operation, both pistons will move an equal amount.
Each of the pistons is provided with a seal 32 in order to ensure that the chamber 20 is fluid tight.
As shown in Figure 2, the device 10 is mounted on the wheel 12 with an air inlet 34 to the port 16 being shown.
The poles 28 and 30 on the device are arranged to pass over a magnetic read head 36 mounted on a non rotating brake calliper 14. As the displaced poles 28 and 30 pass over the read head an electro magnetic pulse is generated.
The time between those pulses is compared with the time between two reference poles (not shown) which are mounted within the main body of the unit on either side of the displaced poles. This location has the following advantages:
a) There is minimal difference between the speed at
which they pass over the read head and that at which
the displaced poles do so, therby lessening any
inaccuracies under acceleration or deceleration;
b) There would be no possibility of the
microprocessor confusing the pole sets for each other
if it received a set of four closely spaced pulses
rather than two pairs;
c) If the movement of one piston was impeded, the
distance from it to its neighbouring reference pole
would be different to that between the other piston
and its neighbouring reference pole. The fact could
be noted by the microprocessor and a 'Pressure unit
faulty' message could be displayed to the driver.
The reference poles also pass over the read head to produce an electro-magnetic pulse. The information from the pulses created by the poles 28 and 30 and the pulses from the reference poles is supplied to a microprocessor unit which can deduce the speed of the vehicle, if required, and also the tyre pressure.
The unit would be best suited to steady speed measurement but inaccuracies due to acceleration or deceleration can be minimised by careful choice of displacement piston size, mass of displaced poles and spring strength. If it is necessary some kind of accelerometer could be mounted in the microprocessor unit to compensate for acceleration.
The information on the tyre pressure can be displayed to the driver either as a "tyre pressure satisfactory" or "tyre pressure unsatisfactory" mode. Alternatively or additionally a figure representing the tyre pressure can be give. The information can be give continually or on demand or when an unsatisfactory pressure is reached.
Claims (22)
1. Tyre pressure monitoring apparatus including pressure responsive means arranged, in use, to be mounted to rotate with a tyre being monitored and arranged to produce a variable proportional to the tyre pressure and receiving means arranged, in use, to receive the variable from the pressure responsive means, and control means arranged to monitor the variable received by the receiving means.
2. Apparatus as claimed in Claim 1 in which the pressure responsive means comprises at least two relatively moveable magnetic portions with the variable being arranged to be proportional to the distance between the magnetic portions.
3. Apparatus as claimed in Claim 2 in which one of the magnetic portions is arranged to move in response to a change in tyre pressure in a tyre, when the device is mounted on a tyre.
4. Apparatus as claimed in Claim 3 in which at least one magnetic portion is in communication with a fluid chamber and another part of that fluid chamber is in communication with a moveable member arranged to move further into the chamber when the device is mounted on the wheel and the tyre pressure increases.
5. Apparatus as claimed in Claim 4 in which at least one of the magnetic portions is resiliently biased in a direction to tend to reduce the volume of the fluid chamber.
6. Apparatus as claimed in any preceding claim in which the pressure responsive means comprises pulse generation means.
7. Apparatus as claimed in Claim 6 in which the variable is arranged to be the time between pulses generated by the pulse generation means.
8. Apparatus as claimed in any preceding claim, including speed monitoring means arranged, in use, to enable the control means to give an indication of the tyre pressure after account has been taken of the speed of a vehicle on which the apparatus may be mounted.
9. Apparatus as claimed in Claim 8 in which the speed monitoring means comprises means arranged, in use, to be located on a wheel and to give a signal proportional to the speed of rotation of the wheel.
10. Apparatus as claimed in any preceding claim in which the receiving means comprises a magnetic read head.
11. Apparatus as claimed in any preceding claim in which the receiving means is arranged to generate an electromagnetic signal proportional to the tyre pressure.
12. Tyre pressure monitoring apparatus substantially as herein described with reference, and as shown in any of figures 1 to 3 of the accompanying drawings.
13. A vehicle including tyre pressure monitoring apparatus as claimed in any of claims 1 to 12.
14. A method of monitoring tyre pressure comprising monitoring the pressure while the tyre is rotating.
15. A method as claimed in Claim 14 comprising generating a variable as the tyre is rotated with the variable being proportional to the tyre pressure.
16. Apparatus as claimed in Claim 15 in which the variable is proportional to the speed of rotation of the tyre.
17. Apparatus as claimed in Claim 15 or 16 comprising giving an indication of the tyre pressure from the variable after taking the speed of rotation of the tyre into account.
18. Apparatus as claimed in the Claims 15 to 17 comprising generating the variable magnetically.
19. A method as claimed in any of Claims 15 to 18 comprising generating the variable electro-magnetically.
20. A method as claimed in any of Claims 15 to 19 comprising causing two indicators to move relative to each other when there is a change in tyre pressure and using the distance between the two indicators to create the variable.
21. A method of monitoring tyre pressure substantially as herein described with reference to, and as shown in any of figures 1 to 3 of the accompanying drawings.
22. A method as claimed in any of Claims 14 to 21 when using tyre pressure monitoring apparatus as claimed in any of Claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9212048A GB2267759A (en) | 1992-06-06 | 1992-06-06 | Monitoring pressure of rotating tyre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9212048A GB2267759A (en) | 1992-06-06 | 1992-06-06 | Monitoring pressure of rotating tyre |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9212048D0 GB9212048D0 (en) | 1992-07-22 |
| GB2267759A true GB2267759A (en) | 1993-12-15 |
Family
ID=10716679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9212048A Withdrawn GB2267759A (en) | 1992-06-06 | 1992-06-06 | Monitoring pressure of rotating tyre |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2267759A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3828309A (en) * | 1971-12-27 | 1974-08-06 | Omron Tateisi Electronics Co | Apparatus for detecting the internal pressure of a tire |
| US4238955A (en) * | 1978-03-25 | 1980-12-16 | Wabco Fahrzeugbremsen Gmbh | Tire-pressure monitoring device |
| GB2065896A (en) * | 1979-12-19 | 1981-07-01 | Bosch Gmbh Robert | Apparatus for Continuously Monitoring the Air Pressure in Vehicle Tyres |
| GB2122757A (en) * | 1982-07-05 | 1984-01-18 | Labinal | Measuring a parameter of a pneumatic tyre on a motor vehicle |
| GB2123150A (en) * | 1979-07-30 | 1984-01-25 | Goodyear Aerospace Corp | Electromagnetic tyre pressure communicating devices |
| US4658644A (en) * | 1984-10-05 | 1987-04-21 | Dieter Coesfeld | Manometer device for continuous monitoring of the air pressure in vehicle tires |
| EP0263775A2 (en) * | 1986-10-08 | 1988-04-13 | Alligator Ventilfabrik GmbH | Device and method for supervising the air pressure of a vehicle tyre |
| GB2255829A (en) * | 1991-05-15 | 1992-11-18 | Ford Motor Co | Tyre pressure transducer |
-
1992
- 1992-06-06 GB GB9212048A patent/GB2267759A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3828309A (en) * | 1971-12-27 | 1974-08-06 | Omron Tateisi Electronics Co | Apparatus for detecting the internal pressure of a tire |
| US4238955A (en) * | 1978-03-25 | 1980-12-16 | Wabco Fahrzeugbremsen Gmbh | Tire-pressure monitoring device |
| GB2123150A (en) * | 1979-07-30 | 1984-01-25 | Goodyear Aerospace Corp | Electromagnetic tyre pressure communicating devices |
| GB2065896A (en) * | 1979-12-19 | 1981-07-01 | Bosch Gmbh Robert | Apparatus for Continuously Monitoring the Air Pressure in Vehicle Tyres |
| GB2122757A (en) * | 1982-07-05 | 1984-01-18 | Labinal | Measuring a parameter of a pneumatic tyre on a motor vehicle |
| US4658644A (en) * | 1984-10-05 | 1987-04-21 | Dieter Coesfeld | Manometer device for continuous monitoring of the air pressure in vehicle tires |
| EP0263775A2 (en) * | 1986-10-08 | 1988-04-13 | Alligator Ventilfabrik GmbH | Device and method for supervising the air pressure of a vehicle tyre |
| GB2255829A (en) * | 1991-05-15 | 1992-11-18 | Ford Motor Co | Tyre pressure transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9212048D0 (en) | 1992-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |